单项选择题

Jack would have been a top student in his school at the time, but he ______ hard enough.

A．hadn't worked
B．should work
C．didn't work
D．won't work
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单项选择题
My uncle went to the police station to ______ the lost watch.
A．inquire
B．claim
C．demand
D．require
单项选择题
Have you met Bill's brothers I've met one. I didn't know he had______.
A．other
B．the other
C．ones
D．another
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